diff options
Diffstat (limited to 'TAO/docs/tutorials/Quoter/Event_Service/index.html')
| -rw-r--r-- | TAO/docs/tutorials/Quoter/Event_Service/index.html | 30 |
1 files changed, 12 insertions, 18 deletions
diff --git a/TAO/docs/tutorials/Quoter/Event_Service/index.html b/TAO/docs/tutorials/Quoter/Event_Service/index.html index 15e691657c1..e27ab5c93b7 100644 --- a/TAO/docs/tutorials/Quoter/Event_Service/index.html +++ b/TAO/docs/tutorials/Quoter/Event_Service/index.html @@ -57,13 +57,13 @@ class Stock_Consumer : public POA_CosEventComm::PushConsumer { public: Stock_Consumer (); - void push (const CORBA::Any& data, CORBA::Environment &); - void disconnect_push_consumer (CORBA::Environment &); + void push (const CORBA::Any& data TAO_ENV_ARG_DECL); + void disconnect_push_consumer (TAO_ENV_SINGLE_ARG_DECL); // details omitted }; </PRE> - <P>Let us ignore the strange <CODE>CORBA::Environment</CODE> + <P>Let us ignore the strange <CODE>TAO_ENV_ARG_DECL</CODE> arguments and concentrate on the implementation. The <CODE>disconnect_push_consumer()</CODE> method is invoked by the Events Service when it is disconnecting, @@ -76,8 +76,8 @@ public: </P> <PRE> void -Stock_Consumer::push (const CORBA::Any& data, - CORBA::Environment &) +Stock_Consumer::push (const CORBA::Any& data + TAO_ENV_ARG_DECL_NOT_USED) { Quoter::Event *event; if ((data >>= event) == 0) @@ -102,38 +102,32 @@ Stock_Consumer::push (const CORBA::Any& data, } </PRE> - <P>So what was the <CODE>CORBA::Environment</CODE> about? After + <P>So what was the <CODE>TAO_ENV_ARG_DECL</CODE> about? After all it was not used. TAO services must support platforms without support for native C++ exceptions. On those platforms the CORBA specification defines an <EM>alternate mapping</EM> where all the operations use an extra argument to return any exceptions. Notice that the TAO IDL compiler supports both mappings. We have - been using the standard one so far! It is only in some services - and callback objects that the alternate mapping becomes apparent. + been using the standard one so far! It is only if your C++ + compiler does not support exceptions that you need to use + the alternative mapping. </P> <P>Notice that on platforms with native C++ exception support we can safely ignore the extra argument, and use the usual mechanisms to catch and throw exceptions. - Unfortunately we must declare the extra argument. The TAO team - is working on solutions to that problem. For more information on how to use the alternative mapping and how to write portable code for both environments check <A HREF="http://ace.cs.wustl.edu/cvsweb/ace-latest.cgi/ACE_wrappers/docs/exception.html">Using ACE try macros for CORBA programming</A>. </P> - <P>In short, the <CODE>CORBA::Environment</CODE> is ugly, - but it does not affect your code significantly, - and you can still use the regular C++ exception handling - mechanisms. - </P> <P>Going back to our example, when the event channel disconnects we receive a callback, too. At that point we want to forget about the original connection: </P> <PRE> void -Stock_Consumer::disconnect_push_consumer (CORBA::Environment &) +Stock_Consumer::disconnect_push_consumer (TAO_ENV_SINGLE_ARG_DECL_NOT_USED) { this->supplier_proxy_ = CosEventChannelAdmin::ProxyPushSupplier::_nil (); } @@ -259,7 +253,7 @@ class Quoter_Stock_i : public POA_Quoter::Modify_Stock { public: // some details removed... - void disconnect_push_supplier (CORBA::Environment&); + void disconnect_push_supplier (TAO_ENV_SINGLE_ARG_DECL_NOT_USED); private: POA_CosEventComm::PushSupplier_tie < Quoter_Stock_i > supplier_personality_; @@ -321,7 +315,7 @@ POA_CosEventComm::PushSupplier_tie < T >::disconnect_push_supplier () </P> <PRE> void -Quoter_Stock_i::disconnect_push_supplier (CORBA::Environment &) +Quoter_Stock_i::disconnect_push_supplier (TAO_ENV_SINGLE_ARG_DECL_NOT_USED) throw (CORBA::SystemException) { // Forget about the consumer. It is not there anymore |